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Port 2334 (ace-client)

IANA assigns port 2334 to ace-client: ACE Client Auth.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ace-client TCP ACE Client Auth - -
ace-client UDP ACE Client Auth - -

Check what is listening on port 2334

Linux: is anything listening on TCP 2334?
sudo ss -tlnp 'sport = :2334'
Linux: UDP 2334
sudo ss -ulnp 'sport = :2334'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2334
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2334 '
Windows (Command Prompt)
netstat -ano | findstr :2334
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2334 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2334
From Windows
Test-NetConnection HOST -Port 2334
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2334

Block port 2334 in the firewall

ufw
sudo ufw deny 2334/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2334 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2334 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2334' -Direction Inbound -Protocol TCP -LocalPort 2334 -Action Block
ufw
sudo ufw deny 2334/udp
iptables
sudo iptables -A INPUT -p udp --dport 2334 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2334 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2334' -Direction Inbound -Protocol UDP -LocalPort 2334 -Action Block

Related ports

2332rcc-host2333snapp2335ace-proxy2336appleugcontrol

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.